σ1/S1,σ2/S1和文献Р [16]建议的值比较于表1?Р 可认为S1和杆端支承条件及振动模态无关?Р S1可近似由水平向动量方程估计:Р S1=ρBР ()Р 2Р 2Р 2Р +Vchc(V0-Vc)Р , (14)Р εhc=e1,Р Vc=V0=Р (15)(16)(17)Р g(H-hc),Р ,HР ε1=01620+1-Р ×01277-0-1Р (18)Р 10,VcР ,ε1是竖向收缩系数,由本文给出的式(18)计算ε的值和文献[15]所给列表值的相对误差在018%以内?2.3 S0的估计Р 由于实测资料不够丰富,理论计算又不够成熟,因此估计S0的误差要大一些?文献[16]建议,在压力流流态时作用于水工弧形闸门支铰和吊钩上的脉动压力的相对标准差,可按图2取值,并规定:若弧形闸门下游呈无压流态而闸门完全Р 图2 压力流时弧门上的σs/S1Р σs/S1ontaintergatewithpressureflowFig.2 Р 表1 作用在弧门支铰上脉动压力相对标准差的比较Р parisonofstandarddeviationofpulsatingpressureactingontaintergatehingeР 相对开度Р σ1/S1σ2/S1Р [16]Р σs/S1Р 0.0540.1090.1630.2170.2720.3260.3800.4350.4890.5430.598Р 0.00090.00120.00150.00200.00270.00400.00570.00620.00720.00790.00800.00390.00630.00870.01160.01510.02140.02790.03060.03200.03580.03670.0050.0060.0070.0080.00850.0090.0100.0110.0120.0130.015